Hard Spot. An area in the pipe with a hardness level considerably higher than that of the surrounding metal, usually due to localized quenching.
硬块。通常由于局部淬火引起钢管上某一部位硬度值远高于周围金属的硬度值。
Results showed that the hardness level of drying schedules had much influence on both the drying strain developed and the time when it reached its maximum value.
结果表明，基准硬度水平对应变值的大小和最大应变值的到达时间有显著影响。
Device features: high softening rate, low outlet water hardness, simple and convenient regeneration and operation, high automation level.
装置特点：软化效率高、出水硬度低、再生操作简单方便、自动化程度高。
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